Telephone-receiver



G. BOISSONNAULT.

TELEPHONE RECEIVER.

APPLICATION FILED JAN. 29, 1921.

1,401,753. .Patented Dec; 27, 1921.

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' season sorss oimaunn or ss wris'r'r, a so I summons-assumes To all whom'a't may concern:

p GASTON Basso;- NAULT, a subject of the King'of Great Britsin, and a resident of Hewlett, Long Island, Queens county, and State .of New York, ha've invented; certain new a'nduseful Improvemerits in Telephone-Receivers, ofwhich the following is a specification.

This invention relatesParticularlY to receivers of the type used for wire ess ap- The head set ordinarily employed, at times becomes" irksome to the but 1 thereis ys the dim; ger that a signal or signals will be lost g One of 'theobjectsv of 'my invention-is to so construct the head set; that when the.

' operator becomes tired} one of the-receivers may be removed and quickly convertedinto a loud speaking receiver, audlble at a distance from the ear.

A further object'is to so construct the parts that thereceivermay be as readily re-' converted and restored to the head set.

. Still furthrrobjects are to increase the' efiiciency of the receiver, particularly as regards' its auditory characteristics and better fitrit to the amide so as to give the operator the full benefit ofthegreater sensitiveness obtained with my improved construction. v

- In the accompanying drawin r I have illusin but one. of its'practical commercial adaptations hut wish it. understood that modifications may,

I have shown an ear piece supporting disk' trated thednvention ernhodie be made without de artur'e from the true spirit and scope of t e invention as'hereinafter defined and claimed.

In the drawing referred to:

Fi re 1 is a view of a head set from whic one'ofthe receivers has been removed 7 and Fig.7 2 is a, view showing the removed receiver converted into a"loud-speaking ini 5 at the center there is provided a rim or annular lip 27 projecting from the sunken or strument.- 4 Fig." 3'is a transverse sectional view on a somewhat enlarged scale of one of-the head receivers. 7'

Figs 4, 5, 6 and 7 are det achedsectional articularly after long periods-of lation between i sound refiectin screw Specification or hatter-s Patent; Patented Dec. 27 19%3 .dpplication'flled ase 29,1921; semi menses i I g geld therewith, said trumpet being broken away and shown in section.

' In Figs. 1 and 2 the two receivers 10 and l1 of the head set are shown, one attached 8Q,

to the bracket 12 of the head band 13, and

the other'removed from its bracket 1e and Ias having a horn or amplifier 15 attached thereto.

The receivers may be both alike so that en the description of one will suiiice for the appears'to reflect or at least to prevent ab- 18 so'r tion or loss of'the minor sound'waves;-

he sensitiveness 'of the instrument is further increased, I find,-b the provision of a ring-like member, 20, 0 set in rear of the diaphragm to provide an annular air-chamher 21 at the back of the'diaphragm. The efi'ect of this air-chamber apparently is to cushion themovemcnts of the diaphragm in such away as'to increase its responsiveness and there is apparently a cooperative re- 86 this air-chambers and the wall atwthe back of. the case, becausejI fin that better results are obtained where these elements are combined in the relation shown.

vIn frontof and overlying the v 00 diaphragm or ring 22 having a central -''throat or soundoutlet in the nature of an outwardly prov jecting sleeve or collar 23 exteriorly screw as threaded toreceive the correspondingly in-' teriorly screw threaded hub 24 of the ear piece 25. v

The ear piece mayhave a convex exposed face 26 as customary, with such. devices but concave surface to form in efiect a nipple to fit into theorificeof the outer ear. c This construction is of special advantage in that we it assists in excludingextcrnal sounds whiie the receiveris fittd to the 'ear of the op erator and this without discomfort to the wearer. v v y In the construction disclosed, the ear piece supporting member 22 is formed with u flange 28 engaging over a similariy 

